PROC LOGISTIC

[robertrao]

Hello,

I have values like shown below and each row corresponds to the values of a single hospital.

and I am trying to make a ROC chart using Proc Logistic. Unfortunately I get the statistics table but not the ROC curve

Please help me to figure where the mistake was made.

Thank you

HAVE

expectdMortality   CASE-MIX-INDEX    Hospital

2.91                              2.04                           1

2.57                               2.03                          2

1.60                              1.46                           3

ods graphics on;

proc logistic data=HAVE plots=roc;

model expectdMortality = CASE-MIX-INDEX;

run;

ods graphics off;

[Ksharp]

proc logistic data=sashelp.class plots=roc;
model sex=age weight height/outroc=roc ;
run;

[Reeza]

You can't do logistic regression with a continuous dependent variable, it should be binary or ordinal/nominal but definitely not continuous. You can do a linear regression if that's appropriate.

[Rick_SAS]

To follow-up Reeza's comment, your code looks like you might have data in events-trials syntax. 

If your data include the variables NUM_DIED and NUM_TREATED then the observed mortality rate for each unit (doctor or hospital) is OBS_MORT_RATE = NUM_DIED / NUM_TREATED.

PROC LOGISTIC supports a syntax that looks very similar: you specify the number or events AND the number of trials on the left side of the MODEL statement, separating those variables by using the '/' symbol. Thus the syntax is

proc logistic plots=roc;

model NUM_DIED / NUM_TREATED.= case_mix_index;

run;